Never got an answer so I posted a bug at
Mattias Jiderhamn wrote (2010-11-18 10:20):
> Has anyone been able to run Hudson  on Resin 4.0.12...?
> It's running just fine on 4.0.10, but when accessing the main page /
> context root under 4.0.12, a directory listing of the root of the WAR is
> sent with Content-Type application/octet-stream
> Accessing sub pages, such as /manage, seems to work fine.
> 1: http://hudson-ci.org
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